2 switches controlling one light is actually called 3-way because a standard single switch is 2-way (on and off).
You should also 3-way the upper garage bay or even 4-way (3 switches). One by the door to the house, one by the stairs and maybe even one by the garage doors. Think about when you come in late, park the RV and want to walk up the stairs through the upper garage bay. Switches by the roll up doors are nice for when you come into an already open door after it has gotten dark outside while you were working. Switches and wire are cheap and WAY easier to do now.
I have 3-way for my shop lights near the farthest roll up door from the service door along with a second garage door opener button. I leave all the time by shutting off the lights then reaching back in to close the door.
